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Old 13th October 2014, 07:52 AM
Ansel Ansel is offline
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Default Filtering D76?

Hi there,

Have noticed that this year all my batches of D76 accumulate precipitate very quickly, seems very hard to get a clean mix (even with distilled water). I wonder if Kodak are having QC issues....

Anyway I have been using coffee filters to filer out the gunk and decided to buy some proper paper chemical filters.

Question, would 2.7 micron be overkill? I am not in risk of filtering out the good stuff with the bad am I?

Cheers,
Tony
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Old 13th October 2014, 09:53 AM
Terry S Terry S is offline
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I use the Paterson funnel filter to do all my chemicals and even with little precipate each time, it does struggle towards the end. They are 8 micron if I remember rightly so your 2.7 micron is gonna take ages!

Terry S
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Old 13th October 2014, 12:55 PM
Ansel Ansel is offline
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Hi, do you know if it will have any negative effects filtering so fine?
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Old 13th October 2014, 01:07 PM
Terry S Terry S is offline
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Not sure Ansel = you might be best googling it.

Terry S
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Old 13th October 2014, 03:32 PM
Richard Gould Richard Gould is offline
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I use an old coffee filter, not the paper but the permanant type to filter any chemicals that need it, I normally filter D76 as I pour it into a bottle after mixing, but other than that I don't find it needs filtering
Richard
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Old 14th October 2014, 05:28 AM
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Keith Tapscott. Keith Tapscott. is offline
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Are you using the correct temperature for the water when mixing stock?
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Old 14th October 2014, 06:28 AM
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Rob Archer Rob Archer is offline
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I think that D76/ID11 precipitates more in hard water areas. I make my own from the raw chemicals. I don't filter it, just give the bottle of concentrate a swirl before I dilute it (I usually use it at 1:2). The solution is slightly cloudy but I've never noticed any problem with the negs. Any precipitate will be washed away during processing anyway.
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Old 14th October 2014, 07:46 AM
Ansel Ansel is offline
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Hi, yes I am using the right temperature. I have used D76 for a long time now and not had any problems until about a year ago... I just mixes dirty hence my question about the filters.

Does anyone know if a 3 micron filter will be OK?
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Old 14th October 2014, 08:57 AM
paulc paulc is offline
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I purchased a box of unbranded 6" "lab filters" a while back that I use to filter chemicals - I also use coffee filters, but I find they do let through small particles, so for developers, I tend to go for the lab filters.

Ansel: I'd say use what you can lay your hands on. If 3 micron filters are to hand, they will do the job just fine. It may be slow filtering, but I doubt you will be doing gallon batches.
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Old 14th October 2014, 09:16 AM
Ansel Ansel is offline
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Thanks paulc, I am not in any hurry, just wanted to know if it would be OK to use them. Will give them a try and report back.
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